Learn more about National library
A national library is a library specifically established by the government of a country to serve as the preeminent repository of information for that country. Unlike public libraries, these rarely allow citizens to borrow books. Often, they include numerous rare, valuable, or significant works; such as the Library of Congress's Gutenberg Bible. Some of the first libraries were national libraries; for example, the Library of Alexandria was the national library of Ptolemaic Egypt.
National libraries are usually notable for their size, compared to that of other libraries in the same country. Some states which are not independent, but who wish to preserve their particular culture, have established a national library, with all the attributes of such institutions, such as legal deposit.
The first national libraries had their origins in the royal collections of the sovereign or some other supreme body of the state.
 Legal Deposit and Copyright
The principle of legal deposit applies in some countries.
In the United Kingdom the Legal Deposit Libraries Act 2003 restates the Copyright Act of 1911, that one copy of every book published there must be sent to the national library (The British Library); five other libraries (Bodleian Library at Oxford University, Cambridge University Library, National Library of Scotland, Library of Trinity College (Dublin) and the National Library of Wales) are entitled to request a free copy within one year of publication. The international nature of the book publishing industry ensures that all significant English language publications from elsewhere in the world are also included.
In the Republic of Ireland, the Copyright and Related Rights Act 2000 specifies that one copy of every book published is to be delivered to the National Library of Ireland, the library of Trinity College, Dublin, the library of the University of Limerick, the library of Dublin City University, and the British Library. Four copies are to be delivered to the National University of Ireland for distribution to its constituent universities. Further, on demand in writing within twelve months of publication a copy is to be delivered to the Bodleian Library, Cambridge University Library, the National Library of Scotland, and the National Library of Wales.
In Australia, the Copyright Act 1968 and other state Acts requires that a copy of every book published in Australia be deposited with the National Library of Australia, the State Library for each state and certain other libraries such as Parliamentary libraries and University libraries, while in Singapore, the National Library Board Act requires all publishers in Singapore to deposit two copies of every publication to the National Library Board at their own expense within four weeks from the publication date.
A similar system exists in France with respect to the National Library of France; a similar system also exists in Canada with respect to its national library, known as Library and Archives Canada, and in Quebec , the Bibliothèque nationale du Québec which has been entitled to two copies (for publications retailing at less than $250), or one copy (for publications retailing at $250 or above) of books published in Quebec since 1968.
Other countries, like the United States, do not follow this requirement. The United States does, however, require that any publisher submit two copies of a copyrightable work to United States Copyright Office at the Library of Congress - this is known as mandatory deposit - but the Library is selective about which works it retains. The international nature of the book publishing industry ensures that all significant English language publications from elsewhere in the world are also included. It also has the Federal depository libraries, which must receive a copy of all of the publications of the Government Printing Office.
In addition to having a law requiring publishers to deposit books, those countries with legal deposits usually have many other incentives for a proper and speedy deposit, such as a tie-in with laws affecting copyright of the same documents, and/or a cataloguing- in- publication service.
 National bibliographic control
One of the main goals of a national library is fulfilling their nation's part of the common international goal of universal bibliographic control, by ensuring the bibliographic control of all the books or book-like documents published in that particular country or talking about that particular country, in any way.
The first part of the goal is usually achieved through the means of legal deposit laws or (as is the case of the United States) by a host of different programs such as a cataloguing in publication service. By this service, the Library of Congress gives a complete catalogue entry of a book to any publisher who sends a final draft or some form of galley proof of a book currently in production. Other national libraries offer similar services or enforce mandatory practices similar to this.
The second part of the goal is achieved by thorough acquisition programs and collection development policies which target book markets in other nations, and which foster international agreements with other countries with national libraries who have national bibliographic control as one of their goals. Exchange and access protocols are defined permitting these countries to read each other's catalogues, and to standardize catalogue entries, thus making it easier for each national library to become aware of every possible published document which might concern their country.
 International bibliographic control
Another one of the main goals of many a national library is the "export aspect" and the collaborative sides of the universal bibliographic control of all the books in the world. This is done by the exchanges and accords mentioned in the previous section, and also by fostering the creation of standard conceptual tools such as library classification systems and cataloguing rules. The most commonly used of these tools is the International Standard Bibliographic Description or ISBD. It applies to books and periodicals, but also has variants for other book-like material such as the ISBD (ER) for Electronic Resources or digital documents or the ISBD(A) for Antiquarian documents, which were published after the birth of printing but before the industrial era of publishing, which started in the 1820s.
 See also
 External links
- Conference of Directors of National Libraries (CDNL)
- Legal Deposit Libraries Act 2003 setting out the requirements for deposits of all published works in the United Kingdom
- Copyright Act 1968 - Sect 201 setting out the requirements for deposits of all published works in Australia to go to the National Library of Australia.cs:Národní knihovna
de:Nationalbibliothek el:Εθνική βιβλιοθήκη es:Biblioteca Nacional et:Rahvusraamatukogu fr:Bibliothèque nationale fr:Dépôt légal id:Perpustakaan Nasional it:Biblioteca nazionale ja:国立図書館<span class="FA" id="ja" style="display:none;" /> <span class="FA" id="ja" style="display:none;" /> nl:Nationale bibliotheek pl:Egzemplarz obowiązkowy pt:Biblioteca Nacional do Brasil zh:国家图书馆